[Q2] 【Only for those who answered "Yes" in Q1】Generally speaking, during which period of the day would you experience such tiredness most often?

Frequency

% of sub-sample (Base = 479)

% of total sample (Base = 515)

Morning

46

9.6%

8.9%

After lunch

57

)

11.9%

)

11.1%

)

Afternoon

172

) 229

35.9%

) 47.8%

33.4%

) 44.5%

Before getting off duty

75

15.7%

14.6%

Overtime / At night

93

19.4%

18.1%

All day long

10

2.1%

1.9%

Others

5

1.0%

1.0%

Don't know / Hard to say

16

3.3%

3.10%

Total

474

100.0%

Base

479

Missing case(s)

5

[Q3] 【Only for those who answered "Yes" in Q1】What do you feel when you are mentally tired at work? How do you describe your feeling? (Interviewer do not read out the answers, multiple answers allowed)

Frequency

% of total responses (Base = 697)

% of sub-sample (Base = 479)

% of total sample (Base = 515)

Sleepiness (e.g. yawning)

240

34.4%

50.1%

46.6%

Difficult to concentrate

103

14.8%

21.5%

20.0%

Headache / Dizziness

79

11.3%

16.5%

15.3%

Muscle pain and tiredness

72

10.3%

15.0%

14.0%

Having trouble to function properly

40

5.7%

8.4%

7.8%

Become emotional / bad-tempered

32

4.6%

6.7%

6.2%

Feeling stressed

30

4.3%

6.3%

5.8%

Eye fatigue / pain / dry

24

3.4%

5.0%

4.7%

Lower productivity

12

1.8%

2.5%

2.3%

Easy to forget things

12

1.7%

2.5%

2.3%

Not feeling well all over

8

1.2%

1.7%

1.6%

Others

28

4.0%

5.8%

5.4%

Don't know / Hard to say

16

2.4%

3.3%

3.1%

Total

697

100.0%

Base

479

Missing case(s)

10

[Q4] 【Only for those who answered "Yes" in Q1】Generally speaking, how long does such mental tiredness last each time?

Frequency

% of sub-sample (Base = 479)

% of total sample (Base = 515)

1－15 minutes

106

)

22.1%

)

20.6%

)

16－30 minutes

101

)

21.1%

)

19.6%

)

31－60 minutes

52

) 259

10.9%

) 54.1%

10.1%

) 50.3%

1 hour 1 minute－2 hours

65

13.6%

12.6%

2 hour 1 minute－3 hours

34

7.1%

6.6%

3 hour 1 minute－4 hours

23

4.8%

4.5%

More than 4 hours

28

5.8%

5.4%

Don't know / Don't remember

65

13.6%

12.6%

Total

474

100.0%

Mean

1 hour 53 minutes

Standard error

11 minutes

Median

30 minutes

Base

479

Missing case(s)

5

[Q5] 【Only for those who answered "Yes" in Q1】Do you think such mental tiredness has a negative impact on your overall work performance? (If yes, interviewers to probe degree of seriousness)

Frequency

% of sub-sample (Base = 479)

% of total sample (Base = 515)

Yes --- Very serious

9

)

1.9%

)

1.7%

)

Yes --- Quite serious

109

)

22.8%

)

21.2%

)

Yes --- Not quite serious

191

)

39.9%

)

37.1%

)

Yes --- Not serious at all

69

) 378

14.4%

) 78.9%

13.4%

) 73.4%

No

95

19.8%

18.4%

Don't know / Hard to say

6

1.3%

1.2%

Total

478

100.0%

Base

479

Missing case(s)

1

[Q6] 【Only for those who answered "Yes" in Q1】What would you usually do when you experience mental tiredness at work, in order to boost your mental energy? (Interviewers do not read out the answers, multiple answers allowed)

Frequency

% of total responses (Base = 774)

% of sub-sample (Base = 479)

% of total sample (Base = 515)

Have a drink

226

29.2%

47.2%

43.9%

Take a walk outside the office

162

21.0%

33.8%

31.5%

Wash face / Go to the washroom

80

10.3%

16.7%

15.5%

Take a nap

70

9.0%

14.6%

13.6%

Have some snacks

64

8.2%

13.4%

12.4%

Do some exercises

41

5.3%

8.6%

8.0%

Chat with colleagues / Make a phone call

37

4.7%

7.7%

7.2%

Listen to some music / Watch TV

16

2.0%

3.3%

3.1%

Smoke a cigarette

12

1.6%

2.5%

2.3%

Look at the scenery outside the window

8

1.0%

1.7%

1.6%

Browse the Internet

3

0.4%

0.6%

0.6%

Others

14

1.8%

2.9%

2.7%

Do nothing

39

5.1%

8.1%

7.6%

Don't know/ Hard to say

2

0.3%

0.4%

0.4%

Total

774

100.0%

Base

479

Missing case(s)

1

[Q7] 【For all respondents】Then, what would you do to further boost your mental energy even if you are not experiencing any mental tiredness at work? (Interviewers do not read out the answers, multiple answers allowed)

Frequency

% of total responses (Base = 580)

% of total sample (Base = 515)

Have a drink

112

19.3%

21.7%

Wash face

70

12.0%

13.6%

Do some exercises

60

10.3%

11.7%

Have some snacks

54

9.3%

10.5%

Take a nap

31

5.4%

6.0%

Chat with colleagues / Make a phone call

23

4.0%

4.5%

Take a walk outside the office

23

3.9%

4.5%

Listen to some music / Watch TV

19

3.3%

3.7%

Smoke a cigarette

13

2.2%

2.5%

Browse the Internet / Play online games

6

1.1%

1.2%

Look at the scenery outside the window

4

0.6%

0.8%

Others

21

3.5%

4.1%

Do nothing

114

19.6%

22.1%

Don't know/ Hard to say

32

5.5%

6.2%

Total

580

100.0%

Base

515

Missing case(s)

4

[Q8] 【For all respondents】 Have you ever consumed any snacks to recharge yourself at work? (If yes, interviewer to ask "How often do you consume snacks to recharge yourself at work?")

Frequency

Percentage

Yes --- very often

57

)

11.1%

)

Yes --- quite often

31

)

6.1%

)

Yes --- sometimes

144

)

28.0%

)

Yes --- seldom

100

) 332

19.4%

) 64.6%

Never

179

34.8%

Don't know / Hard to say

3

0.6%

Total

515

100.0%

Base

515

Missing case(s)

0

[Q9] 【Only for those who answered "yes" in Q8】What would you usually eat then? (Interviewers do not read out the answers, multiple answers allowed)

Frequency

% of total responses (Base = 533)

% of sub-sample (Base = 332)

% of total sample (Base = 515)

Biscuits

158

29.7%

47.6%

30.7%

Candies

131

24.5%

39.5%

25.4%

Chewing gum

64

12.0%

19.3%

12.4%

Chocolate

62

11.6%

18.7%

12.0%

Potato chips

26

4.8%

7.8%

5.0%

Preserved plum / Beef jerk / Pork jerk

21

4.0%

6.3%

4.1%

Fruits

18

3.4%

5.4%

3.5%

Toasts / Sandwiches

15

2.8%

4.5%

2.9%

Chicken wings

6

1.1%

1.8%

1.2%

French fries

4

0.8%

1.2%

0.8%

Others

19

3.5%

5.7%

3.7%

Don't know/ Hard to say

10

1.9%

3.0%

1.9%

Total

533

Base

332

Missing case(s)

1

[Q10] 【For all respondents】 Have you ever consumed any drinks to recharge yourself at work? (If yes, interviewer to ask "How often do you consume drinks to recharge yourself at work?")

Frequency

Percentage

Yes --- very often

126

)

24.4%

)

Yes --- quite often

48

)

9.3%

)

Yes --- sometimes

172

)

33.4%

)

Yes --- seldom

71

) 417

13.7%

) 80.8%

Never

95

18.5%

Don't know / Hard to say

3

0.7%

Total

515

100.0%

Base

515

Missing case(s)

0

[Q11] 【Only for those who answered "yes" in Q10】What would you usually drink then? (Interviewers do not read out the answers, multiple answers allowed)

Frequency

% of total responses (Base = 583)

% of sub-sample (Base = 417)

% of total sample (Base = 515)

Tea (all kinds)

195

33.4%

46.8%

37.9%

Water

151

25.9%

36.2%

29.3%

Coffee

138

23.7%

33.1%

26.8%

Soft drink

52

8.9%

12.5%

10.1%

Juice

25

4.3%

6.0%

4.9%

Energy drink

9

1.5%

2.2%

1.7%

Ovaltine / Horlicks

4

0.7%

1.0%

0.8%

Essence of chicken

2

0.4%

0.5%

0.4%

Milk

2

0.3%

0.5%

0.4%

Others

4

0.8%

1.0%

0.8%

Don't know/ Hard to say

1

0.1%

0.2%

0.2%

Total

583

100.0%

Base

417

Missing case(s)

2

[Q12] 【For all respondents】Do you know what substances in our food are essential for maintaining our normal mental energy? (Interviewers do not read out the answers, multiple answers allowed)

Frequency

% of total responses (Base = 549)

% of total sample (Base = 515)

Caffeine

219

39.8%

42.5%

Glucose

20

3.7%

3.9%

Carbohydrates

12

2.1%

2.3%

Substances in tea

10

1.9%

1.9%

Vitamins

7

1.3%

1.4%

Sugar

5

1.0%

1.0%

Protein

2

0.3%

0.4%

Others

28

5.2%

5.4%

Don't know / Hard to say

246

44.8%

47.8%

Total

549

100.0%

Base

515

Missing case(s)

10

[Q13] 【For all respondents】 Do you know the main functions of glucose to our brain and bodies? (Interviewers do not read out the answers, multiple answers allowed)